package dfbz.demo04;

public class Test03 {
    public static void main(String[] args) {
        int num1=1;
        int num2=1;
        int count=1;
        int month=3;
        while (month<=21){
            count=num1+num2;
            num2=num1;
            num1=count;
            month++;
        }
        System.out.println(count);
    }
}
